NYPD investigators say returning to the former -- -- and so how. Or -- time -- to vanish back in 1979. It is all part of building a case against the man who confessed to his kidnapping and murder. I was he's a pretty Jim Dolan is at the scene with the very latest jam. There's the NYPD back here again today -- -- not looking at parts of the building they couldn't get to. Backed just a few months ago hoping to find some evidence however reminded that -- on -- was here before he was murdered. Or that his body. Was here and they did -- out several bags of evidence -- have to be examined by forensic experts for DNA they're also looking for zapper fragments. Police and FBI. We're here up back in April searching the basement which back in nineteen -- not as a storage room for a vote -- It was there that eighteen about six year old eighth on -- Was lured with the promise of a -- While the child was on his way to school. At least that's sort Pedro Hernandez told back -- when he was arrested he was a stock boy at the bodega back in 1979. And he claims he strangled -- and through his body outlook the track he's in jail awaiting trial but -- abduction and murder that captured the attention. Public that nation back that might not pay his parents still live in the same apartment they lived in back in 1979 they've never -- They still have the same phone number. Always hoping that -- -- would somehow. Find his way home. Reporting live so -- Channel --

This transcript has been automatically generated and may not be 100% accurate.

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